diff --git a/fastNLP/saver/config_saver.py b/fastNLP/saver/config_saver.py
index 434a0de4..06522465 100644
--- a/fastNLP/saver/config_saver.py
+++ b/fastNLP/saver/config_saver.py
@@ -10,6 +10,8 @@ class ConfigSaver(object):
 
     def __init__(self, file_path):
         self.file_path = file_path
+        if not os.path.exists(self.file_path):
+            raise FileNotFoundError("file {} NOT found!".__format__(self.file_path))
 
     def save_section(self, section_name, section):
         cfg = configparser.ConfigParser()
@@ -33,3 +35,119 @@ class ConfigSaver(object):
                     logger.warning("this is a warning #TODO")
             cfg.set(section_name,key, section[key])
         cfg.write(open(self.file_path, 'w'))
+
+    def save_config_file(self, section_name, section):
+
+        def get_section(file_path, sect_name):
+            sect = ConfigSection()
+            ConfigLoader("", "").load_config(file_path, {sect_name: sect})
+            return sect
+
+        def read_section(file_path):
+            sect_name = None
+
+            sect_list = {}
+            sect_key_list = []
+
+            single_section = {}
+            single_section_key = []
+
+            with open(file_path, 'r') as f:
+                lines = f.readlines()
+
+            for line in lines:
+                if line.startswith('[') and line.endswith(']\n'):
+                    if sect_name is None:
+                        pass
+                    else:
+                        sect_list[sect_name] = single_section, single_section_key
+                        single_section = {}
+                        single_section_key = []
+                        sect_key_list.append(sect_name)
+                    sect_name = line[1: -2]
+                    continue
+
+                if line.startswith('#'):
+                    single_section[line] = '#'
+                    single_section_key.append(line)
+                    continue
+
+                if line.startswith('\n'):
+                    single_section_key.append('\n')
+                    continue
+
+                if '=' not in line:
+                    log = create_logger(__name__, './config_saver.log')
+                    log.error("can NOT load config file [%s]" % file_path)
+                    raise RuntimeError("can NOT load config file {}".__format__(file_path))
+
+                key = line.split('=', maxsplit=1)[0].strip()
+                value = line.split('=', maxsplit=1)[1].strip() + '\n'
+                single_section[key] = value
+                single_section_key.append(key)
+
+            if sect_name is not None:
+                sect_list[sect_name] = single_section, single_section_key
+                sect_key_list.append(sect_name)
+
+            return sect_list, sect_key_list
+
+        def write_section(file_path, sect_list, sect_key_list):
+            with open(file_path, 'w') as f:
+                for sect_key in sect_key_list:
+                    single_section, single_section_key = sect_list[sect_key]
+                    f.write('[' + sect_key + ']\n')
+                    for key in single_section_key:
+                        if key == '\n':
+                            f.write('\n')
+                            continue
+                        if single_section[key] == '#':
+                            f.write(key)
+                            continue
+                        f.write(key + ' = ' + single_section[key])
+                    f.write('\n')
+
+        section_file = get_section(self.file_path, section_name)
+        if len(section_file.__dict__.keys()) == 0:#the section not in file before
+            with open(self.file_path, 'a') as f:
+                f.write('[' + section_name + ']\n')
+                for k in section.__dict__.keys():
+                    f.write(k + ' = ')
+                    if isinstance(section[k], str):
+                        f.write('\"' + str(section[k]) + '\"\n\n')
+                    else:
+                        f.write(str(section[k]) + '\n\n')
+        else:
+            change_file = False
+            for k in section.__dict__.keys():
+                if k not in section_file:
+                    change_file = True
+                    break
+                if section_file[k] != section[k]:
+                    logger = create_logger(__name__, "./config_loader.log")
+                    logger.warning("section [%s] in config file [%s] has been changed" % (
+                        section_name, self.file_path
+                    ))
+                    change_file = True
+                    break
+            if not change_file:
+                return
+
+            sect_list, sect_key_list = read_section(self.file_path)
+            if section_name not in sect_key_list:
+                raise AttributeError()
+
+            sect, sect_key = sect_list[section_name]
+            for k in section.__dict__.keys():
+                if k not in sect_key:
+                    sect_key.append('\n')
+                    sect_key.append(k)
+                sect[k] = str(section[k])
+                if isinstance(section[k], str):
+                    sect[k] = "\"" + sect[k] + "\""
+                sect[k] = sect[k] + "\n"
+            sect_list[section_name] = sect, sect_key
+            write_section(self.file_path, sect_list, sect_key_list)
+
+
+